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Derivative Financial Instruments (Schedule of Derivative Instruments Outstanding) (Details) - October 2015 to December 2015 [Member]	Sep. 30, 2015 MMBTU $ / MMBTU $ / bbl MMBbls
NYMEX-HH [Member] \| Gas Contract [Member] \| Fixed Price Swaps [Member]
Derivative [Line Items]
Volume, Gas Contracts \| MMBTU	369
Average Swap Price \| $ / MMBTU	4.31
Argus LLS [Member] \| Oil Contract [Member] \| Three-Way Collars [Member]
Derivative [Line Items]
Volume, Oil Contracts \| MMBbls	1,012
Sub Floor	32.73
Floor	45.00
Ceiling	75.45